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1. Support Nuvoton targets: - NUMAKER_IOT_M487 V1.3 Compared to V1.2, V1.3 adds support for ESP8266 RTS/CTS/RST pins. V1.3 is incompatible with V1.2 on ESP8266. 2. Change storage to NUSD (SD card in SDIO bus mode) from SD (SD card SPI bus mode) (1) Add COMPONENT_NUSD.lib. (2) Add component NUSD (target.components_add). (3) Change default BlockDevice to NUSD: Override BlockDevice::get_default_instance (nusd.provide-default-blockdevice). Required since mbed-cloud-client 2.1.0 (arm_uc_blockdevice_ext) or in: mbed-bootloader/modules/storage/pal-blockdevice/source/arm_uc_pal_blockdevice_mbed.cpp (4) Enable kvstore with blockdevice type being "other". i) Override get_other_blockdevice() (nusd.provide-kvstore-other-blockdevice). ii) Configure storage type to "FILESYSTEM". iii)Configure file system type to "LITTLE". vi) Configure block device type to "other". v) Configure external size to 64MiB, which cannot overlap with update-client. storage-address/update-client.storage-size. 3. Change back UARTSerial tx/rx buffer size from 1024/1024 to 256/256. This can reduce memory footprint by (1024 - 256) * 2 = 1.5KiB. Because this configuration influences both ESP8266 and default console (platfrom/mbed_retarget.cpp), memory reduction can achieve 1.5KiB x 2 = 3KiB. 4. Enlarge ESP8266 'send tcp data' timeout on Nuvoton targets Pelion connection has some failure rate with this. Enlarging ESP8266_SEND_TIMEOUT can just relieve the issue. A ticket has raised to address it: ARMmbed/mbed-os#11544
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